org.ws4d.java.structures
Class LockedMap

java.lang.Object
  org.ws4d.java.structures.HashMap
      org.ws4d.java.structures.LockedMap

All Implemented Interfaces:

Lockable

public class LockedMap
extends HashMap
implements Lockable

Class synchronizes access to a map.

Nested Class Summary

Nested classes/interfaces inherited from class org.ws4d.java.structures.HashMap

HashMap.Entry

Constructor Summary

LockedMap()
Constuctor.

LockedMap(HashMap map)
Constuctor.

Method Summary

void	clear()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
Set	entrySet()
boolean	equals(java.lang.Object o)
void	exclusiveLock() Acquires an exclusive lock.
java.lang.Object	get(java.lang.Object key) Get associated value to given key.
int	hashCode()
boolean	isEmpty()
Set	keySet()
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
void	putAll(HashMap t)
boolean	releaseExclusiveLock() Releases an exclusive lock of the current thread.
void	releaseSharedLock() Releases a shared lock of the current thread.
java.lang.Object	remove(java.lang.Object key)
void	sharedLock() Acquires a shared lock.
int	size()
java.lang.String	toString()
boolean	tryExclusiveLock() Try to get an exclusive lock immediately.
boolean	trySharedLock() Tries to get a shared lock immediately.
DataStructure	values()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

LockedMap

public LockedMap()

Constuctor. Uses new HashMap.

LockedMap

public LockedMap(HashMap map)

Constuctor.

Parameters:

map - Map, which should be synchronized

Method Detail

sharedLock

public void sharedLock()

Description copied from interface: Lockable

Acquires a shared lock. If the lock cannot be allocated immediately, the thread is blocked until allocation is possible.

Specified by:

sharedLock in interface Lockable

exclusiveLock

public void exclusiveLock()

Description copied from interface: Lockable

Acquires an exclusive lock. If the lock cannot be allocated immediately, the thread is blocked until allocation is possible.

Specified by:

exclusiveLock in interface Lockable

releaseSharedLock

public void releaseSharedLock()

Description copied from interface: Lockable

Releases a shared lock of the current thread.

Specified by:

releaseSharedLock in interface Lockable

releaseExclusiveLock

public boolean releaseExclusiveLock()

Description copied from interface: Lockable

Releases an exclusive lock of the current thread.

Specified by:

releaseExclusiveLock in interface Lockable

Returns:

true = if last exclusive lock of this thread is released.

tryExclusiveLock

public boolean tryExclusiveLock()

Description copied from interface: Lockable

Try to get an exclusive lock immediately.

Specified by:

tryExclusiveLock in interface Lockable

Returns:

true if the lock has been allocated, false otherwise

trySharedLock

public boolean trySharedLock()

Description copied from interface: Lockable

Tries to get a shared lock immediately.

Specified by:

trySharedLock in interface Lockable

Returns:

true if the lock has been allocated, false otherwise

clear

public void clear()

Overrides:

clear in class HashMap

containsKey

public boolean containsKey(java.lang.Object key)

Overrides:

containsKey in class HashMap

containsValue

public boolean containsValue(java.lang.Object value)

Overrides:

containsValue in class HashMap

entrySet

public Set entrySet()

Overrides:

entrySet in class HashMap

get

public java.lang.Object get(java.lang.Object key)

Description copied from class: HashMap

Get associated value to given key. A key == null will always return null;

Overrides:

get in class HashMap

Parameters:

key - the key to lookup

Returns:

the value for the given key or null

isEmpty

public boolean isEmpty()

Overrides:

isEmpty in class HashMap

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Overrides:

put in class HashMap

putAll

public void putAll(HashMap t)

Overrides:

putAll in class HashMap

remove

public java.lang.Object remove(java.lang.Object key)

Overrides:

remove in class HashMap

size

public int size()

Overrides:

size in class HashMap

values

public DataStructure values()

Overrides:

values in class HashMap

keySet

public Set keySet()

Overrides:

keySet in class HashMap

hashCode

public int hashCode()

Overrides:

hashCode in class HashMap

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class HashMap

toString

public java.lang.String toString()

Overrides:

toString in class HashMap